/*
	FluorineFx open source library 
	Copyright (C) 2007 Zoltan Csibi, zoltan@TheSilentGroup.com, FluorineFx.com 
	
	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.
	
	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	Lesser General Public License for more details.
	
	You should have received a copy of the GNU Lesser General Public
	License along with this library; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
using System;
using System.Collections;
using System.Reflection.Emit;
using FluorineFx.Util;

namespace FluorineFx.Expression
{
	/// <summary>
	/// This type supports the Fluorine infrastructure and is not intended to be used directly from your code.
	/// Represents logical equality operator.
	/// </summary>
	class OpEqual : BinaryOperator
	{
		public OpEqual()
		{
		}

		protected override object Evaluate(object context, EvaluationContext evalContext)
		{
			object left = Left.EvaluateInternal( context, evalContext );
			object right = Right.EvaluateInternal( context, evalContext );

			if (left == null)
			{
				return (right == null);
			}
			else if (right == null)
			{
				return false;
			}
			else if (left.GetType() == right.GetType())
			{
				return left.Equals(right);                    
			}
			else if (left.GetType().IsEnum && right is string)
			{
				return left.Equals(Enum.Parse(left.GetType(), (string) right));
			}
			else if (right.GetType().IsEnum && left is string)
			{
				return right.Equals(Enum.Parse(right.GetType(), (string) left));
			}
			else
			{
				return CompareUtils.Compare(left, right) == 0;
			}		
		}

	}
}
